_lat2_(3)

📦
version 3.12.1 · 2 versions
, in arch rolling

💅 NAME

hey bestie, welcome to _lat2_(3) from the Library Functions Manual — this is lat2: triangular matrix, convert double <=> single. periodt. 💖

🌸 SYNOPSIS

🎀 Functions

  • subroutine dlat2s (uplo, n, a, lda, sa, ldsa, info) — DLAT2S converts a double-precision triangular matrix to a single-precision triangular matrix.
  • subroutine zlat2c (uplo, n, a, lda, sa, ldsa, info) — ZLAT2C converts a double complex triangular matrix to a complex triangular matrix.
lowkey auxiliary energy: both routines are auxiliary, so no argument checking — the docs said it, not me. 💅

💖 DETAILED DESCRIPTION

okay so this page has the full function tea below. It's giving “two triangular-matrix conversion besties, one double → single, one complex*16 → complex.” 💅✨

🦋 FUNCTION DOCUMENTATION

✨ subroutine dlat2s

subroutine dlat2s (character uplo, integer n, double precision, dimension( lda, * ) a, integer lda, real, dimension( ldsa, * ) sa, integer ldsa, integer info)

DLAT2S converts a double-precision triangular matrix to a single-precision triangular matrix. slay.

🎯 Purpose

DLAT2S converts a DOUBLE PRECISION triangular matrix, SA, to a SINGLE PRECISION triangular matrix, A.

RMAX is the overflow for the SINGLE PRECISION arithmetic, and DLAS2S checks that all the entries of A are between -RMAX and RMAX. If not, the conversion is aborted and a flag is raised. 🚨

This is an auxiliary routine so there is no argument checking.

🌟 Parameters

  • UPLO — UPLO is CHARACTER*1. = 'U': A is upper triangular; = 'L': A is lower triangular.
  • N — N is INTEGER. The number of rows and columns of the matrix A. N >= 0.
  • A — A is DOUBLE PRECISION array, dimension (LDA,N). On entry, the N-by-N triangular coefficient matrix A.
  • LDA — LDA is INTEGER. The leading dimension of the array A. LDA >= max(1,N).
  • SA — SA is REAL array, dimension (LDSA,N). Only the UPLO part of SA is referenced. On exit, if INFO=0, the N-by-N coefficient matrix SA; if INFO>0, the content of the UPLO part of SA is unspecified.
  • LDSA — LDSA is INTEGER. The leading dimension of the array SA. LDSA >= max(1,M).
  • INFO — INFO is INTEGER:
    • = 0: successful exit.
    • = 1: an entry of the matrix A is greater than the SINGLE PRECISION overflow threshold, in this case, the content of the UPLO part of SA in exit is unspecified.

👑 Author

  • Univ. of Tennessee
  • Univ. of California Berkeley
  • Univ. of Colorado Denver
  • NAG Ltd.

Definition at line 110 of file dlat2s.f.

✨ subroutine zlat2c

subroutine zlat2c (character uplo, integer n, complex*16, dimension( lda, * ) a, integer lda, complex, dimension( ldsa, * ) sa, integer ldsa, integer info)

ZLAT2C converts a double complex triangular matrix to a complex triangular matrix. iconic. 🦋

🎯 Purpose

ZLAT2C converts a COMPLEX*16 triangular matrix, SA, to a COMPLEX triangular matrix, A.

RMAX is the overflow for the SINGLE PRECISION arithmetic. ZLAT2C checks that all the entries of A are between -RMAX and RMAX. If not, the conversion is aborted and a flag is raised. 🚨

This is an auxiliary routine so there is no argument checking.

🌟 Parameters

  • UPLO — UPLO is CHARACTER*1. = 'U': A is upper triangular; = 'L': A is lower triangular.
  • N — N is INTEGER. The number of rows and columns of the matrix A. N >= 0.
  • A — A is COMPLEX*16 array, dimension (LDA,N). On entry, the N-by-N triangular coefficient matrix A.
  • LDA — LDA is INTEGER. The leading dimension of the array A. LDA >= max(1,N).
  • SA — SA is COMPLEX array, dimension (LDSA,N). Only the UPLO part of SA is referenced. On exit, if INFO=0, the N-by-N coefficient matrix SA; if INFO>0, the content of the UPLO part of SA is unspecified.
  • LDSA — LDSA is INTEGER. The leading dimension of the array SA. LDSA >= max(1,M).
  • INFO — INFO is INTEGER:
    • = 0: successful exit.
    • = 1: an entry of the matrix A is greater than the SINGLE PRECISION overflow threshold, in this case, the content of the UPLO part of SA in exit is unspecified.

👑 Author

  • Univ. of Tennessee
  • Univ. of California Berkeley
  • Univ. of Colorado Denver
  • NAG Ltd.

Definition at line 110 of file zlat2c.f.

👑 AUTHOR

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